JEE 2021 -- 25th Feb Shift 1 -- Chemistry Stoichiometry Question

Question

0.4 g mixture of NaOH, Na₂CO₃ and some inert impurities was first titrated with \({N \over 10}\) HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of Na₂CO₃ in the mixture is _________. (Rounded-off to the nearest integer)